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2 years ago

When was technology created?

Computers and Technology

1 answer:

ANEK [815]2 years ago

3 0

Answer:

two million years ago

Thomas Edison, American inventor who, singly or jointly, held a world-record 1,093 patents. In addition, he created the world's first industrial research laboratory.

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You are to design class called Employee whose members are as given below:

frozen [14]

Answer:

//The Employee Class

public class Employee {

char name;

long ID;

//The constructor

public Employee(char name, long ID) {

this.name = name;

this.ID = ID;

}

//Method Get Person

public void getPerson (char newName, long newId){

this.ID = newName;

this.ID = newId;

}

//Method Print

public void print(){

System.out.println("The class attributes are: EmpName "+name+" EmpId "+ID);

}

The working of the class is shown below in another class EmployeeTest

Explanation:

public class EmployeeTest {

public static void main(String[] args) {

Employee employee1 = new Employee('a', 121);

Employee employee2 = new Employee('b', 122);

Employee employee3 = new Employee('c', 123);

employee1.print();

employee2.print();

employee3.print();

}

In the EmployeeTest class, Three objects of the Employee class are created.

The method print() is then called on each instance of the class.

6 0

3 years ago

Suppose the CashRegister needs to support a method void undo() that undoes the addition of the preceding item. This enables a ca

a_sh-v [17]

Answer:

previousAddition instance variable

Explanation:

In order to accomplish this you would need to add a previousAddition instance variable. In this variable you would need to save the amount that was added at the end of the process. Therefore, if a mistake were to occur you can simply call the previousAddition variable which would have that amount and subtract it from the total. This would quickly reverse the mistake, and can be easily called from the undo() method.

3 0

3 years ago

Write a SELECT statement that returns these columns from the Customers table:

Nastasia [14]

Answer:

SELECT customer_last_name, customer_city, customer_zip FROM customers WHERE customer_state = 'IL' ORDER BY customer_last_name DESC;

Explanation:

Here, we are given a SCHEMA with the table name customers.

It's creation command and commands to insert values are also given.

We have to print the customer last name, city and zip code of all the customers who have their state as IL in the decreasing order of their last names.

Let us learn a few concepts first.

1. To print only a specified number of columns:

We can write the column names to be printed after the SELECT command.

2. To print results as per a condition:

We can use WHERE clause for this purpose.

3. To print in descending order:

We can use ORDER BY clause with the option DESC to fulfill the purpose.

Therefore, the answer to our problem is:

SELECT customer_last_name, customer_city, customer_zip FROM customers WHERE customer_state = 'IL' ORDER BY customer_last_name DESC;

Output of the command is also attached as screenshot in the answer area.

3 0

3 years ago

To make data goes to just appropriate device we use

Stells [14]

Answer:

To make sure that data sent from a device is just received by appropriate device we use "<u>Switch</u>"

Explanation:

Switch is the networking device. It is used to connect all the Local area networks in a computer network. The switch store the addresses of all computers over the network. Whenever data packet arrives to the switch, it just read the address of destination computer and just send it to appropriate device instead of all devices.

Hub is also used for this purpose, but it has no ability to read the address and send the packet to all devices over the network.

<em>So, we use Switch to send data to appropriate device.</em>

8 0

3 years ago

A game design company develops a game in which players run a grocery store and need to keep tabs on the dollar amount of goods s

sdas [7]

I do believe it is Inventory management but I can never tell if it is the right answer. so my regards if it the wrong answer.

6 0

3 years ago